added schema for post citations to multiple papers
added support for indexing multiple citations per post to incoming.find_or_insert_posts()
basic test for multiple paper citations per post
switched Paper/Person/SIG.recommendations to get recs from unified posts storage by citationType
added utilities for converting Paper.recommendations to unified posts storage
updated paper merging utilities to new schema: no more recommendations array; new citations array
stop including old Recommendations class in recentEventsDeque
remove REST interfaces for old Recommendations class
updated rec delivery to use unified post storage
make templates filter recs from posts display
implemented test for issue 93: duplicate records for versioned arxiv IDs
fixed issue 93
added method for adding Citations where needed
refactored to create Post.add_citations() method
modified citations schema to provide post to citations mapping
added convenience function of updating to unified posts schema
added support for multiple citations to post and paper templates
added tests for URL based arxiv ID recognition and old arxiv ID dedupe
another fix for issue 93, another case of duplicated arxiv IDs
added arxiv URL recognizers per issue 23